2834 Nitrites, Nitrates

2834 (01/1988-..) Nitrites, Nitrates 28341000 (01/1988-..) Nitrites 28342100 (01/1988-..) Nitrate of Potassium 28342200 (01/1988-12/2001) Nitrates of Bismuth 28342910 (01/1988-12/1998) Nitrates of Barium, of Beryllium, of Cadmium, of Cobalt, and of Nickel 28342920 (01/1999-..) Nitrates of Barium, of Beryllium, of Cadmium, of Cobalt, of Nickel and of Lead 28342930 (01/1988-12/2006) Nitrates of Copper and of Mercury 28342940 (01/2007-..) Nitrates of Copper 28342950 (01/1988-12/1998) Nitrates of Lead 28342980 (01/2002-..) Nitrates (Excl. of Potassium, Barium, Beryllium, Cadmium, Cobalt, Nickel, Copper, Lead and Mercury) 28342990 (01/1988-12/2001) Nitrates (Excl. of Potassium, Bismuth, Barium, Beryllium, Cadmium, Cobalt, Nickel, Copper, Mercury and Lead)